PlayStation Plus Members Get Free Battlefield 4 on PS3 for a Week

Thats right,if you have a PS+ sub you can play BF4 on PS4 for a whole week.

Originally Posted by Gamespot

PlayStation 3 owners with a PlayStation Plus membership will be able to get more than a sampling of Battlefield 4 starting later today, when a free trial version of the game is being launched.
It's not explained exactly when the timer begins, but you'll have a week during which to play as much Battlefield 4 as you want.

Once today's weekly PlayStation Store update goes live, you'll find a full game trial of Battlefield 4 available for download.